[FFmpeg-trac] #3394(avformat:new): mp4 -> mkv produces broken file

[FFmpeg]

#3394: mp4 -> mkv produces broken file
-------------------------------------+-------------------------------------
             Reporter:  tessus       |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  important    |                Component:  avformat
              Version:  git-master   |               Resolution:
             Keywords:  mkv          |               Blocked By:
  regression                         |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by cehoyos):

 I tested the following:
 {{{
 $ ffmpeg -i mp4-mkv-input-big.mp4 -i mp4-mkv-input-big.srt -scodec copy
 -vcodec copy -acodec ac3 ~/out.mkv
 ffmpeg version N-60710-g61d5970 Copyright (c) 2000-2014 the FFmpeg
 developers
   built on Feb 18 2014 10:42:46 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      52. 64.100 / 52. 64.100
   libavcodec     55. 52.102 / 55. 52.102
   libavformat    55. 33.100 / 55. 33.100
   libavdevice    55. 10.100 / 55. 10.100
   libavfilter     4.  1.102 /  4.  1.102
   libswscale      2.  5.101 /  2.  5.101
   libswresample   0. 17.104 /  0. 17.104
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'mp4-mkv-input-big.mp4':
   Metadata:
     major_brand     : isom
     minor_version   : 1
     compatible_brands: isomavc1
     creation_time   : 2014-02-09 20:22:13
   Duration: 01:41:11.96, start: 0.000000, bitrate: 2473 kb/s
     Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
 1920x1080 [SAR 1:1 DAR 16:9], 1962 kb/s, 23.98 fps, 23.98 tbr, 24k tbn,
 47.95 tbc (default)
     Metadata:
       creation_time   : 2014-02-09 20:22:13
     Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp,
 380 kb/s (default)
     Metadata:
       creation_time   : 2014-02-09 17:38:55
     Stream #0:2(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo,
 fltp, 124 kb/s (default)
     Metadata:
       creation_time   : 2014-02-09 17:54:44
 Input #1, srt, from 'mp4-mkv-input-big.srt':
   Duration: N/A, bitrate: N/A
     Stream #1:0: Subtitle: subrip
 Output #0, matroska, to '/home/cehoyos/out.mkv':
   Metadata:
     major_brand     : isom
     minor_version   : 1
     compatible_brands: isomavc1
     encoder         : Lavf55.33.100
     Stream #0:0(und): Video: h264 (avc1 / 0x31637661), yuv420p, 1920x1080
 [SAR 1:1 DAR 16:9], q=2-31, 1962 kb/s, 23.98 fps, 1k tbn, 24k tbc
 (default)
     Metadata:
       creation_time   : 2014-02-09 20:22:13
     Stream #0:1(eng): Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, 5.1,
 fltp, 448 kb/s (default)
     Metadata:
       creation_time   : 2014-02-09 17:38:55
     Stream #0:2: Subtitle: subrip
 Stream mapping:
   Stream #0:0 -> #0:0 (copy)
   Stream #0:1 -> #0:1 (aac -> ac3)
   Stream #1:0 -> #0:2 (copy)
 Press [q] to stop, [?] for help
 frame=145580 fps=2897 q=-1.0 Lsize= 1789364kB time=01:41:11.96
 bitrate=2414.1kbits/s
 video:1454812kB audio:332061kB subtitle:57 data:0 global headers:0kB
 muxing overhead 0.136231%
 }}}
 {{{
 $ md5sum out.mkv
 35ea0dd5238a3fdbf7d169850bbfc30b  out.mkv
 }}}
 The output file plays fine in vlc for five minutes showing correct
 subtitles.

 I can reproduce the problem with the file mp4-mkv-broken.mkv you uploaded,
 please find out what is different about the command I am testing.

 Unrelated:
 Please remove the following options from your configure line, they have no
 effect:
 --as=yasm --disable-shared --enable-static --enable-pthreads --enable-
 postproc --enable-bzlib --enable-zlib --enable-filters --enable-runtime-
 cpudetect

--
Ticket URL: <https://trac.ffmpeg.org/ticket/3394#comment:16>
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